Fire-extinguishing compound.



25v and 3 gether.

4o ter.

PATENT Fries.

GUY EDWARDS, onNnW YORK..N. Y.

FiRE EXTINGUiSHlNG COMPOUND.

SPECIFICATION forming part of Letters Patent No. 639,674, dated December19,1899.

Application filedQctober I2,1'899. Serial No. 733,344. (Nospeoimena) 5New York, have invented a certain new and useful Improvement inFire-Extinguishing Compounds, of which the following is a specification.My compound is of the class which is prero pared and used in the form of'a dry powder.

I have discovered that it is practicable to employ gunpowder in theusual form of moderately-coarse grains, so mingled with finely broken orpulverized non-inflammable and r 5 carbonic acid producing material thatthe compound will remain stored an indefinite period without caking orotherwise changing and is in condition to be easily, rapidly, and widelydifiused in the air contiguous to a fi're and produce a great volume offireextinguishing gas. I propose to use hollow cylindrical cases ofpasteboard or the like for containing the compound and provide means forhanging or otherwise holding such in conspicuous easily-accessibleplaces ready for easy use when a fire occurs, as has been long practicedwith other dry compounds for this purpose.

To manufacture my compound, mix five 0 parts (5) of carbonate of lime(it thereis in ita small quantity of'clean sand, as the dust frommarble-sawing, there is no objection) and four and nineteen-twentieths(4%) parts of bicarbonate of soda and grind well to- If there is no sandin the carbonate of lime, mixture.. If sand of the proper purity is notavailable, rock may be crushedand the finelybroken sharp gether underconditions as dry as possible,

some should be introduced in the fragments will serve still bet- Whenthese have been well worked toone-twentieth part (1%) of common coarsegun- I powder is intimately mixed by agitating and pressing two or moretimes through a-coarseriddle. The powder is then filled loosely into thecases and the ends of the cases closed and the whole exterior wellcoated 'witha waterproof varnish. v 'The sand or pulverized rock keepsthebicarbonate of soda from what is known as caking.

The powder contains j ust su fiicient of coarse grains of explosive tocause a rapid and thorough scattering of the carbonates and promotes therapid production of the desired. firekilling carbonic-acid gas.

The compound is harmless, cheap, unchangeable, and peculiarly efiicient.

The smell of the small portion of burned gunpowder is sufficient to givenotice of the presence of the fire-killing gas and towarn all againstremaining and breathing in spaces so filled.

I claim as my 1nvention-- 1. A fire-extinguishing compound .in the formof a dry powder containing carbonate of lime, sand, bicarbonate of soda,in about the proportions specified. I

2. A fire-extinguishing compound in the form of a dry powder containingcarbonate of lime, sand, bicarbonate of soda, and gunpowder in theconditions described, inclosed in a moisture-proof casing adapted forstorage GUY EDWARDS.

Witnesses:

.J. B. GLAUTlCE,

C. A. WEED.

